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Under the radar
http://www.lifein19x19.com/viewtopic.php?f=15&t=17289
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Author:  Gomoto [ Tue Feb 25, 2020 2:25 am ]
Post subject:  Under the radar

While watching one of BadukDoctor's videos, Katago suggested me to take a closer look at this shape:

Click Here To Show Diagram Code
[go]$$B
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . O . . |
$$ . . . . . . . . O . . . |
$$ . . X . . . X X X O . . |
$$ . . . . . . X O O X X . |
$$ . . . . . . . . . O . . |
$$ . . . . . . . . . . . . |
$$ ------------------------+[/go]


The shape is a continuation of this joseki:

Click Here To Show Diagram Code
[go]$$B
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . O . . |
$$ . . . . . . . . . . . . |
$$ . . X . . . X X . O . . |
$$ . . . . . . X O O . . . |
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . . . . |
$$ ------------------------+[/go]

Author:  Gomoto [ Tue Feb 25, 2020 2:27 am ]
Post subject:  Re: Under the radar

Let us take this postion from a pro game as a reference:

Yu Zhengqi, 7d - Shida Tatsuya, 7d, W+1.5 (Komi 6.5)
62nd NHK Cup, Round 1, 2014-03-03


Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . X O . O . . . X . . . . . . X O . |
$$ | . X O X O . X . X X X O . O X X O O . |
$$ | . . . X . . . X O X O . . X X O X . . |
$$ | . . . X . X X O O O O O . . . O . . . |
$$ | . . . . . . O . . . X . . . . . . . . |
$$ | . . . . . . . . . X . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . O . O . . . . . X . . . X X X O . . |
$$ | . . . . . O . . . . . . . X O O X X . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Author:  Gomoto [ Tue Feb 25, 2020 2:31 am ]
Post subject:  Re: Under the radar

The pros play all the time this continuation:

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . X O . O . . . X . . . . . . X O . |
$$ | . X O X O . X . X X X O . O X X O O . |
$$ | . . . X . . . X O X O . . X X O X . . |
$$ | . . . X . X X O O O O O . . . O . . . |
$$ | . . . . . . O . . . X . . . . . . . . |
$$ | . . . . . . . . . X . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . O . O . . . . . X . . . X X X O 3 . |
$$ | . . . . . O . . . . . . . X O O X X . |
$$ | . . . . . . . . . . . . . 2 . . O 1 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Author:  Gomoto [ Tue Feb 25, 2020 2:34 am ]
Post subject:  Re: Under the radar

But now take note of the strong white positions on the outside of the shape:

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . X O . O . . . X . . . . . . X O . |
$$ | . X O X O . X . X X X O . O X X O O . |
$$ | . . . X . . . X O X O . . X X Q X . . |
$$ | . . . X . X X O O O O O . . . Q . . . |
$$ | . . . . . . O . . . X . . . . . . . . |
$$ | . . . . . . . . . X . . . . . Q . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . Q . . |
$$ | . . . . . . . . . . . . . . . Q . . . |
$$ | . Q . Q . . . . . X . . . X X X Q . . |
$$ | . . . . . Q . . . . . . . X O O X X . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Author:  Gomoto [ Tue Feb 25, 2020 2:37 am ]
Post subject:  Re: Under the radar

White can surprise black with this alternative if there is such strong support on the outside.

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . X O . O . . . X . . . . . . X O . |
$$ | . X O X O . X . X X X O . O X X O O . |
$$ | . . . X . . . X O X O . . X X O X . . |
$$ | . . . X . X X O O O O O . . . O . . . |
$$ | . . . . . . O . . . X . . . . . . . . |
$$ | . . . . . . . . . X . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . O . O . . . . . X . . . X X X O . . |
$$ | . . . . . O . . . . . . . X O O X X . |
$$ | . . . . . . . . . . . . . 1 . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Attachment:
alt.JPG
alt.JPG [ 78.5 KiB | Viewed 7813 times ]

Author:  Gomoto [ Tue Feb 25, 2020 2:41 am ]
Post subject:  Re: Under the radar

Example continuation:

Click Here To Show Diagram Code
[go]$$W
$$ ---------------------------------------
$$ | . . . . O . . . . . . . . . . . . . . |
$$ | . . X O . O . . . X . . . . . . X O . |
$$ | . X O X O . X . X X X O . O X X O O . |
$$ | . . . X . . . X O X O . . X X O X . . |
$$ | . . . X . X X O O O O O . . . O . . . |
$$ | . . . . . . O . . . X . . . . . . . . |
$$ | . . . . . . . . . X . . . . . O . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . 8 . . O . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . O . O . . . . . X . 7 . X X X O . . |
$$ | . . . . . O . . . . . . . X O O X X . |
$$ | . . . . . . . . . . . . 3 1 5 4 O 2 . |
$$ | . . . . . . . . . . . . . . . . 6 . . |
$$ ---------------------------------------[/go]


Attachment:
alt2.JPG
alt2.JPG [ 79.33 KiB | Viewed 7810 times ]

Author:  Gomoto [ Tue Feb 25, 2020 2:45 am ]
Post subject:  Re: Under the radar

Just be careful. The usefullness of this alternative move depends a lot on the surrounding position.

Author:  Gomoto [ Tue Feb 25, 2020 2:50 am ]
Post subject:  Re: Under the radar

In this game by Baduk Doctor the move would have been a good alternative too (7:24 in the video):

https://www.youtube.com/watch?v=u9Rb25T ... e=youtu.be

Attachment:
alt3.JPG
alt3.JPG [ 74.89 KiB | Viewed 7795 times ]

Author:  Uberdude [ Tue Feb 25, 2020 2:53 am ]
Post subject:  Re: Under the radar

Gomoto wrote:
The pros play all the time this continuation:


Not all, there was a Go Seigen game in one of JF's books where they (can't recall if Go or opponent, but probably Go) had the hane resistance, or at least it was talked about in the commentary. But yes, it is an alternative we shouldn't neglect to consider, and pros probably do suffer from too much autopilot. However, there could be a selection bias in that if the hane is a good resistance and black is aware of that he won't cut in the corner but immediately play the 2nd line descent.

Author:  Gomoto [ Tue Feb 25, 2020 3:00 am ]
Post subject:  Re: Under the radar

Good old Go Seigen, always a pleasure to meet him again.

Author:  Gomoto [ Tue Feb 25, 2020 3:02 am ]
Post subject:  Re: Under the radar

Two continuations:

Attachment:
alt4.JPG
alt4.JPG [ 75.42 KiB | Viewed 7797 times ]


Attachment:
alt5.JPG
alt5.JPG [ 75.36 KiB | Viewed 7796 times ]

Author:  Gomoto [ Tue Feb 25, 2020 3:06 am ]
Post subject:  Re: Under the radar

Just to be clear. My intention is not at all to disrespect the Pros. I just post because I like unusual moves. A usual move would be of less interest to me, as it is already widely known.

Author:  ez4u [ Tue Feb 25, 2020 5:12 am ]
Post subject:  Re: Under the radar

The earliest example in GoGoD, B+R.
Click Here To Show Diagram Code
[go]$$B Zhou Pingqiang (White) - Lin Zhihan Taiwan Guoshou League 2007-07-24
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . O . . . . . . . X . . . . . |
$$ | . X . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . 7 . . . |
$$ | . . . . . . . . . . . . . . . . . 3 . |
$$ | . . X . . . . . . . . . . 0 . O O 1 . |
$$ | . . . . . . . . . . . . . . . O X 5 . |
$$ | . X . O . . . . . , . . . . X O X 4 . |
$$ | . . O . . O . . . . . . . X 9 X O X 6 |
$$ | . . . . . . . . . . . . . . . 8 O 2 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Author:  Gomoto [ Tue Feb 25, 2020 5:36 am ]
Post subject:  Re: Under the radar

In my 105.000 game database there are two more games with this move and the 4th line expansion (and 3 with the third line expansion).
This is one of them:

Fan Tingyu 9d - Motoki Katsuya 8d, W+Resign (Komi 6.5)
20th Nongshim Cup, Game 4, 2018-10-19


Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . X X X . . . . . . . . . . . . . . . |
$$ | . O X O . X . . . . . . . X . . . . . |
$$ | . O X O . . . X . , . . . . . X . X . |
$$ | . O X O . . . . . . . . . . . . . . . |
$$ | . X O X . O . . . . . . . . . . O . . |
$$ | . O O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . O O X . |
$$ | . . O . . . . . . . . . . . . O X . . |
$$ | . . . O . X . . X X . . . . X O X . . |
$$ | . . X . O X . X O . . . . X . X O X . |
$$ | . . . . O . . O . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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